CVE-2026-5121

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-30. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
63%
KEV
Not listed

Published

March 30, 2026

Last Modified

September 1, 2026

Advisory Details (18)

Auto-updated Sep 15, 2026
Patch available. Sources: redhat.
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:16008
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:15087
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:14937
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:14773
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:13812
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:12274
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:12071
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:11768
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:10097
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:10065
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:8873
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:8867
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:8866
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:8864
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:8534
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.2 Advanced Update Support.

https://access.redhat.com/errata/RHSA-2026:8521
redhat Patch Available

Affected: Red Hat Enterprise Linux 7 Extended Lifecycle Support.

https://access.redhat.com/errata/RHSA-2026:8517
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:8510

Vendor Advisories for CVE-2026-5121(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhaiis/model-opt-cuda-rhel9:17806819842026-06-10redhat
redhatrhcos-413.92.202605271328-02026-06-04redhat
redhatrhcos-4.19.9.6.202605201155-02026-05-27redhat
redhatrhaiis/vllm-rocm-rhel9:17792236512026-05-20redhat
redhatrhcos-417.94.202605112123-02026-05-20redhat
redhatrhaiis/vllm-cuda-rhel9:17792236542026-05-20redhat
redhatrhcos-414.92.202605060243-02026-05-13redhat
redhatrhcos-415.92.202605060220-02026-05-13redhat
redhatrhaiis/vllm-spyre-rhel9:17782445462026-05-12redhat
redhatrhaiis/vllm-rocm-rhel9:17782445312026-05-11redhat
redhatrhaiis/model-opt-cuda-rhel9:17782445592026-05-11redhat
redhatrhaiis/vllm-cuda-rhel9:17782746662026-05-11redhat
redhatrhcos-418.94.202604240015-02026-05-11redhat
redhatrhcos-412.86.202604281506-02026-05-08redhat
redhatdiscovery/discovery-ui-rhel9:17781567562026-05-07redhat
redhatrhpam-7/rhpam-smartrouter-rhel8:7.13.5-4.17773257082026-05-05redhat
redhatrhcos-416.94.202604211449-02026-04-30redhat
redhatrhui5/rhua-tp-rhel9:17774595042026-04-29redhat
redhatrhui5/rhua-rhel9:17768688422026-04-23redhat
redhatinsights-proxy/insights-proxy-container-rhel9:17768689612026-04-22redhat
redhatlibarchive-0:3.3.3-1.el8_4.22026-04-22redhat
redhatlibarchive-0:3.5.3-5.el9_42026-04-20redhat
redhatlibarchive-0:3.3.3-5.el8_8.22026-04-20redhat
redhatlibarchive-main-3.8.7-1.hum12026-04-20redhat
redhatlibarchive-0:3.3.3-6.el8_6.12026-04-20redhat
redhatlibarchive-0:3.5.3-2.el9_0.42026-04-20redhat
redhatlibarchive-0:3.5.3-7.el9_6.12026-04-20redhat
redhatlibarchive-0:3.5.3-5.el9_2.22026-04-20redhat
redhatlibarchive-0:3.3.2-8.el8_2.22026-04-16redhat
redhatlibarchive-0:3.5.3-9.el9_72026-04-16redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libarchive3.4.3-2, 3.4.3-2+deb11u1, 3.4.3-2+deb11u2, 3.4.3-2+deb11u33.4.3-2+deb11u4—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libarchive3.6.2-1, 3.6.2-1+deb12u1, 3.6.2-1+deb12u2, 3.6.2-1+deb12u33.6.2-1+deb12u4—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libarchive3.7.4-43.7.4-4+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libarchive3.7.4-4, 3.8.4-1, 3.8.5-1, 3.8.6-13.8.7-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(5)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 270 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:31 UTCEPSS rescore
  3. 2026-09-16 14:08 UTCEPSS rescore
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-15 03:11 UTCEPSS rescore
  6. 2026-09-13 16:47 UTCEPSS rescore
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-10 09:35 UTCEPSS rescore
  9. 2026-09-08 22:01 UTCEPSS rescore
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-04 05:07 UTCEPSS rescore
  13. 2026-09-02 14:12 UTCEPSS rescore
  14. 2026-09-01 13:54 UTCEPSS rescore
  15. 2026-09-01 09:34 UTCEG score recompute
  16. 2026-09-01 09:34 UTCVendor advisory
  17. 2026-09-01 09:34 UTCGHSA enrichment
  18. 2026-09-01 09:30 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  19. 2026-09-01 08:57 UTCEG score recompute
  20. 2026-09-01 08:57 UTCVendor advisory
  21. 2026-09-01 08:56 UTCGHSA enrichment
  22. 2026-09-01 08:52 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  23. 2026-09-01 04:40 UTCEPSS rescore
  24. 2026-08-30 19:17 UTCEPSS rescore
  25. 2026-08-30 01:22 UTCEPSS rescore
Show 75 more
  1. 2026-08-28 21:42 UTCEPSS rescore
  2. 2026-08-27 14:25 UTCEPSS rescore
  3. 2026-08-26 14:46 UTCEPSS rescore
  4. 2026-08-25 13:49 UTCEPSS rescore
  5. 2026-08-23 00:19 UTCEPSS rescore
  6. 2026-08-21 23:49 UTCEPSS rescore
  7. 2026-08-20 22:55 UTCEPSS rescore
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 09:49 UTCEG score recompute
  12. 2026-08-16 09:49 UTCVendor advisory
  13. 2026-08-16 09:49 UTCGHSA enrichment
  14. 2026-08-15 01:30 UTCEPSS rescore
  15. 2026-08-14 23:29 UTCVendor advisory
  16. 2026-08-14 23:29 UTCGHSA enrichment
  17. 2026-08-14 19:10 UTCVendor advisory
  18. 2026-08-14 19:10 UTCGHSA enrichment
  19. 2026-08-14 14:50 UTCVendor advisory
  20. 2026-08-14 14:50 UTCGHSA enrichment
  21. 2026-08-14 10:31 UTCVendor advisory
  22. 2026-08-14 10:31 UTCGHSA enrichment
  23. 2026-08-14 06:11 UTCEG score recompute
  24. 2026-08-14 06:11 UTCVendor advisory
  25. 2026-08-14 06:11 UTCGHSA enrichment
  26. 2026-08-13 22:00 UTCEPSS rescore
  27. 2026-08-13 00:49 UTCVendor advisory
  28. 2026-08-13 00:49 UTCGHSA enrichment
  29. 2026-08-12 20:30 UTCEG score recompute
  30. 2026-08-12 20:30 UTCVendor advisory
  31. 2026-08-12 20:30 UTCGHSA enrichment
  32. 2026-08-12 13:51 UTCEPSS rescore
  33. 2026-08-12 01:00 UTCVendor advisory
  34. 2026-08-12 01:00 UTCGHSA enrichment
  35. 2026-08-11 20:40 UTCEG score recompute
  36. 2026-08-11 20:40 UTCVendor advisory
  37. 2026-08-11 20:40 UTCGHSA enrichment
  38. 2026-08-11 08:01 UTCVendor advisory
  39. 2026-08-11 08:01 UTCGHSA enrichment
  40. 2026-08-11 03:41 UTCEG score recompute
  41. 2026-08-11 03:41 UTCVendor advisory
  42. 2026-08-11 03:41 UTCGHSA enrichment
  43. 2026-08-11 00:00 UTCEPSS rescore
  44. 2026-08-10 11:59 UTCVendor advisory
  45. 2026-08-10 11:59 UTCGHSA enrichment
  46. 2026-08-10 06:22 UTCVendor advisory
  47. 2026-08-10 06:21 UTCGHSA enrichment
  48. 2026-08-10 02:02 UTCVendor advisory
  49. 2026-08-10 02:02 UTCGHSA enrichment
  50. 2026-08-09 21:42 UTCVendor advisory
  51. 2026-08-09 21:42 UTCGHSA enrichment
  52. 2026-08-09 17:23 UTCEG score recompute
  53. 2026-08-09 17:23 UTCVendor advisory
  54. 2026-08-09 17:23 UTCGHSA enrichment
  55. 2026-08-09 13:46 UTCEPSS rescore
  56. 2026-08-09 13:03 UTCVendor advisory
  57. 2026-08-09 13:03 UTCGHSA enrichment
  58. 2026-08-09 05:44 UTCEG score recompute
  59. 2026-08-09 05:44 UTCVendor advisory
  60. 2026-08-09 05:44 UTCGHSA enrichment
  61. 2026-08-08 16:37 UTCEPSS rescore
  62. 2026-08-08 09:15 UTCVendor advisory
  63. 2026-08-08 09:15 UTCGHSA enrichment
  64. 2026-08-08 04:56 UTCVendor advisory
  65. 2026-08-08 04:56 UTCGHSA enrichment
  66. 2026-08-08 00:36 UTCVendor advisory
  67. 2026-08-08 00:36 UTCGHSA enrichment
  68. 2026-08-07 20:16 UTCEG score recompute
  69. 2026-08-07 20:16 UTCVendor advisory
  70. 2026-08-07 20:16 UTCGHSA enrichment
  71. 2026-08-07 15:56 UTCVendor advisory
  72. 2026-08-07 15:56 UTCGHSA enrichment
  73. 2026-08-06 18:27 UTCEG score recompute
  74. 2026-08-06 18:27 UTCVendor advisory
  75. 2026-08-06 18:27 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-5121?
CVE-2026-5121 is a critical vulnerability published on March 30, 2026. A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for…
When was CVE-2026-5121 disclosed?
CVE-2026-5121 was first published in the National Vulnerability Database on March 30, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5121 actively exploited?
CVE-2026-5121 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 36.6% of all scored CVEs.
What is the CVSS score of CVE-2026-5121?
CVE-2026-5121 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-5121?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5121, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-5121

Explore →

Is Your Infrastructure Affected by CVE-2026-5121?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs